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    <title>day1-扩展卡片</title>
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        <div class="panel active">
            <p>图片1</p>
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        <div class="panel">
            <p>图片2</p>
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            <p>图片3</p>
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        <div class="panel">
            <p>图片4</p>
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        <div class="panel">
            <p>图片5</p>
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